As it is only six feet across, it is barely noticeable.
仅6英尺宽，很难被发现。
新概念英语第三册
Lesson 42 Modern cavemen
📚 句中词汇解析
从本句中提取的重要词汇
prep. 穿过;横穿，横过;与…交叉;在…对面;
adv. 横过，越过;在对面;交叉;斜对面;
💡 cro, cru =cross,表示”十字形,交叉”
"The only access to the farmhouse is across the fields."
去那农舍的唯一通路是穿过田野。
近义：through, athwart, on, per, thru, to
adv. 仅仅，勉强，好容易才;几乎不，几乎没有;赤裸裸地，无遮蔽地;公然地，露骨地，公开地;
💡 bare 光的+ ly...的→ 仅仅,只不过,几乎不
"Her voice was barely audible above the noise."
一片嘈杂，她的声音只能勉强听得见。
近义：about, approximately, insufficiently, nearly, nigh, practically
adj. 显而易见的，明显的;引人注目的，令人瞩目的;显著的，重要的;可以察觉的;
💡 notice注意,表示行为+able 可...的 → adj. 引人注目的, 值得注意的
"This effect is particularly noticeable in younger patients."
这种作用在年轻一些的病人身上尤为明显。
近义：appreciable, notable, noted, noteworthy, observable, perceivable
反义：indiscernible, invisible, undiscernible, unnoticeable, unperceivable